c: -62+x=-14+46

=>\(x-62=46-14=32\)

=>\(x=32+62=94\)

d: \(25+\left(x-5\right)=-123-\left(15-123\right)\)

=>\(x-5+25=-123-15+123\)

=>\(x+20=-15\)

=>\(x=-15-20=-35\)

`c) -62 + x = -14 + 46`

`-62 + x = 32`

`x = 32 - (-62)`

`x = 94`

Vậy `x = 94`

`d) 25 + ( x - 5 ) = -123 - ( 15 - 123 )`

`25 + ( x - 5 ) = -123 - 15 + 123`

`25 + ( x - 5 ) = - 15`

`x - 5 = -15 - 25`

`x - 5 = -40`

`x = -40 + 5`

`x = -35`

Vậy `x = -35`

c) 3(x -1 ) + 3(2 – x) = 0
3x-3+6-3x=0
 3=0 (vô lí)
không có giá trị x thỏa mãn 
d) 5x + 3(x – 8) = 8
5x+3x-24=8
8x=32
x=32:8
x=4

Bài 1

-45.36 + 64.(-45) + 100

= -45.(36 + 64) + 100

= -45.100 + 100

= -4500 + 100

= -4400

Bài 2

(6x + 3²) : 3 = 17

6x + 9 = 17 × 3

6x + 9 = 51

6x = 51 - 9

6x = 42

x = 42 : 6

x = 7

a . 13-|x+5|=14

\(\Rightarrow Ix+5I=-1\)

\(\Rightarrow x\in\varnothing\)

b.27-3 | x-2|=15

\(3Ix-2I=12\)

\(|x-2|=4\)

\(\Rightarrow\orbr{\begin{cases}x-2=4\\x-2=-4\end{cases}\Leftrightarrow\orbr{\begin{cases}x=6\\x=-2\end{cases}}}\)

c 10+|x-15|=3

\(Ix-15I=-7\)

\(\Rightarrow x\in\varnothing\)

2 Tìm số nguyên a sao cho 

a -32 (a+21)=0

\(a+21=0\)

\(a=-21\)

b (a+1) (a-2)=0

\(\Rightarrow\orbr{\begin{cases}a+1=0\\a+2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-1\\a=-2\end{cases}}}\)

c 15+a^2=24

\(a^2=9\)

\(a=\pm3\)

học tốt

Phân tích vế trái \(\left(27-x\right)+\left(15+x\right)=27+15-x+x=42\)

\(\Rightarrow x-24=42\)

\(x=66\)

\(\left(27-x\right)+\left(15+x\right)=x-24\)

\(\Leftrightarrow27-x+15+x-x+24=0\)

\(\Leftrightarrow66-x=0\)

\(\Leftrightarrow x=66\)

Vậy \(x=66\)

( 27 - x ) + ( 15 + x ) = x - 24

<=> 27 -x + 15 + x = x - 24

<=> 42 =x - 24

<=> x = 18

a)\(x-5=-1\)

⇔\(x=4\)

b)\(x+30=-4\)

⇔\(x=-34\)

c)\(x-\left(-24\right)=3\)

⇔\(x+24=3\)

⇔\(x=-21\)

e)\(\left(x+5\right)+\left(x-9\right)=x+2\)

⇔\(x+5+x-9-x-2=0\)

⇔\(x-6=0\)

⇔\(x=6\)

f)\(\left(27-x\right)+\left(15+x\right)=x-24\)

⇔\(27-x+15+x-x+24=0\)

⇔\(66-x=0\)

⇔\(x=66\)

\(a.x-5=-1\)                      \(b.x+30=-4\)

\(x=\left(-1\right)+5\)                        \(x=\left(-4\right)-30\)

\(x=4\)                                    \(x=-34\)

\(c.x-\left(-24\right)=3\)                    \(e.\left(x+5\right)+\left(x-9\right)=x+2\)

\(x=3+\left(-24\right)\)                         \(x+5+x-9=x+2\)

\(x=-21\)                                  \(2x-4=x+2\)

                                                \(2x-x=2+4\)

                                                 \(x=6\)

\(f.\left(27-x\right)+\left(15+x\right)=x-24\)

\(27-x+15+x=x-24\)

\(27+15=x-24\)

\(42=x-24\)

\(x=24+42\)

\(x=66\)

a) x = 0

b) x = -1

c) x  = -2

a: =>16/x=-4/5

hay x=-20

b: =>x+7/15=-2/3

=>x+7=-10

hay x=-17